Rock-drill chuck.



B. HASTINGS.

ROCK DRILL CHUCK.

LEWM. Patented. Dec. 5,1916.

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BENJAMIN HASTINGS, F CLEVELAND, OHIO, ASSIGNOR, BY MESNE ASSIGNMENTS, TO SULLIVAN MACHINERY COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

ROCK-DRILL CHUCK.

Application filed April 1, 1912.

To all whom it may concern:

Be it known that I, BENJAMIN Has'rINes, a citizen of the United States, and a resident of Cleveland, Cuyahoga county, Ohio, have invented an Improvement in Rock- Drill Chucks, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

This invention relates to drill holding chucks, and more especially though not exclusively to rock drill chucks.

The invention will be best understood by reference to the following description, when taken in connection with the accompanying illustration of one specific embodiment thereof, while its scope will be more particularly pointed out in the appended claims .In the drawings: Figure 1 is a plan of a drill holding chuck embodying my invention; Fig. 2 is an end-elevation-of the chuck as viewed from the left-hand side of Fig. 1, the drill steel being shown in section Fig. 3

- is a cross-sectional view on line 33 of Fig.

1; and Fig. 4: is a longitudinal sectional view taken on line 4-4: of Fig. 1, the drill steel being shown in elevation.

Referring to the drawings and to the embodiment of my invention which I have there disclosed for illustrative purposes, I have there shown-a piston rod 5, having an enlarged end portion 6, which constitutes the holder of the chuck. This holder is provided with a longitudinally tapered recess 7, opening out of the end thereof and is preferably provided with a plurality of lateral apertures, herein two designated by the numerals Sand 9 leading outward from the inner portion of said recess. 'In this recess are placed a plurality of chuck blocks, herein two designated by the numerals 10 and 11. The exterior surfaces of these blocks have a taper conforming to the taper of the recess 7, as clearly shown in Fig. 4.

The recess 7 is provided with oppositely disposed surfaces 12 and 13, preferably of substantially uniform cross-sectional shape throughout their respective lengths. Herein T have chosen to make these surfaces substantially semi-cylindricaL' Preferably the blocks 10 and llare also provided with corresponding external semi-cylindrical surfaces 14 and 15, This shape of the bearing a fall bearing; eurface' for Specification of Letters Patent.

Patented Dec. 5, 1916.

Serial No. 687,568.

the blocks at all positions. If desired, removable liners 16 and 17 may be provided to take up the wear in the chuck, and where these liners are employed, they will of course be suitably shaped to fit the inner surfaces of the recess 7 and the outer surfaces of the blocks 10 and 11. The liner 16 is preferably provided with suitable means, such for example as lips 18 and 19, to prevent its longitudinal movement, and the liner 17 is provided with corresponding lips 20 and 21.

The inner surfaces of the blocks 10 and 11 are suitably shaped to grip a drill-steel 22, which may be of any suitable cross-sectional shape, round, octagonal, hexagonal, or otherwise, the blocks for this purpose being provided with longitudinal grooves 23 and 24 respectively. The blocks 10 and 11 are provided with suitable interengaging means to efiect their mutual longitudinal movement and prevent them from coming out of place, except when properly manipulated by the operator, such means herein comprising a pair of lugs 2525, provided on the block 10, and projecting into corresponding recesses 26-26 provided in the block 11. The depth of the recesses 26 is such as to permit the blocks to approach each other to a sufficient extent to grip the smallest steel within the capacity of the chuck.

In order that the blocks 10 and 11 may bereadily removed from and inserted into the holder, the block 10 is provided with an inclined surface or surfaces 27 oblique to 'a'nd'diverging from the opposite face of the block 11 toward the inner end thereof. Preferably also the block 11 is provided with similarly inclined surfaces 29 and30, herein having a slightly different incline as compared with the surfaces 27 and 28. This shape'of the blocks permits them to be with drawn rearwardly, and then outwardly through the apertures 8 and 9 respectively, the block 10 being first withdrawn from the aperture 8 as indicated in the dotted lines in Fig. 4: and the block 11 being afterward withdrawn from the aperture 9, it being understood that the drillateei will be pre visual-y removed h Preferably the blocks and 11 are pro vided at their rear ends with lugs 31 and 32 respectively projecting outwardly from the -apertures 8 and 9. Either or both of these .hardened block 35, to receive the thrust'of the drill steel 22.

In operation'the drill-steel is placed between the chuck blocks. A light tap on the rear of the blocks serves to hold the drill-steel in position until with the first stroke of the piston the momentum of the blocks automatically tends to drive them forward in their holder, thereby tightening the drillsteel securely in relation to the blocks and holder. The chuck therefore is automatir cally self-tightening and yet may be readily released. The interlocking nature of the blocks accomplishes the desired self-center- 'ing of the drill in relation to the pistonand piston rod, since the blocks must always amove 1n unison. "course that if the chuck blo'ckswere'notfinter-locking, one might be forced ahead' of It will be understood of "the other, in which case the drill would be thrown out of line. It would otherwise'be necessary also to rotate the piston in order to drive first on one block and then on the other. To remove the drill, it is only necessary to force the blocks backward by driving'either upon the front ends of the blocks l or upon'the lugs 31 and 32, as herelnbefore I described.

Having thus described one embodiment of my invention, what I claim'is 1.,A drill chuck having, in combination,

a holder provided with a longitudinally tapered recess and a plurality of lateral apertures leading therefrom, and a plurality of externally tapered chuck blocks located in *saidr cess and mounted to rock one upon the. other.

2. In a drill chuck, a holder provided with a longitudinally tapered recess and a plu- -rality of lateral apertures leading therefrom, and a plurality of externally tapered "chuck blocks non-rotatably mounted in said recess and having mutually interlocking a holder having a. head provided with a I longitudinally tapered recess opening out a of one end thereof and having a reduced portion provided with lateral apertures'leading outward from the inner end of said recess,

and a plurality of interlocking longitl idinally tapered chuck blocks located in said recess.

4. A drill chuck having, in combination, a holder having a head provided with a longitudinally tapered recess opening out of one end thereof and having a reduced portion provided with lateral apertures leading outward from the inner end of said recess, and

a plurality of interlocking longitudinally tapered chuck blocks located in said recess and provided with lugs projecting into said apertures respectively.

5. A drill chuck having, in combination, a holder having a head provided with a longitudinally tapered recess opening out of one end thereof and having a reduced portion provided with lateral apertures leading outward from the inner end of said recess, and a plurality of interlocking longitudinally tapered chuck blocks located in said recess and provided with lugs projecting outwardly through said apertures respectively.

6. A drill chuck having, in combination, a holder provided with a longitudinally tapered recess opening out of one end thereof and lateral apertures leading outward from theinnerend of said recess, and a plurality of inter-engaging longitudinally "tapered chuck blocks located in said recess and having provision wherebythey are held against rotation therein.

7. A 'drlll chuck having, in combination,

holder provided'with a longitudinally tapered recess opening out of one end thereof and lateral apertures leading outward from the inner end of said recess, and a plurality of intenengaging longitudinally tapered chuck blocks having coiiperating surfaces mountedto rock one on the otherlocated in I said recess and provided with lugs projecting into said apertures respectively.

8.'- Aidrill chuck having, in combination, a holder provided with a lateral chuck receivingrecess and a communicating longitudinally tapered recess having its smaller 'end at the forward end of the holder, and a 'pair of externally tapered drill-embracing chuckblocks mounted to slide in said recess,

- said blocks being provided one with a recess and the other with a lug engaging the lastr mentioned recess, said tapered recess and said blocks having engaging portlons formed to prevent rotation of said blocks within said tapered recess, and said blocks having between them a drill-bit receiving opening.

9. A drill chuck having, in combination, a

-holderprovided with a longitudinally tapered recess and a pair of externally tapered chuck blocks located in said recess, one of said blocks being provided with a pair of recesses and the other with a pair of lugs entering the latter recesses, one ofisaid ;blocks being provided with oppositely in- 'clined 'opposedsurfaces oblique to -the :axis

of said holder and diverging from the opposed face of the other block toward opposite ends thereof.

10. A drill chuck having, in combination, a holder provided with a longitudinally tapered recess and a pair of externally tapered chuck blocks located in said recess, one of said blocks being provided with a pair of recesses, and the other with a pair of lugs entering the latter recesses, said blocks having oppositely inclined pairs of surfaces oblique to the axis of said holder and diverging from each other toward opposite ends of said blocks.

11. A drill chuck having, in combination, a holder provided with a longitudinally tapered recess and a pair of externally tapered chuck blocks located in. said recess, one of said blocks being provided with a pair of recesses and the other with a pair of lugs entering the latter recesses, one of said blocks being provided with an inclined surface oblique to the axis of said holder and adjacent to and diverging from the opposite face of the other block toward the outer end thereof.

12. In a drill chuck, a holder having a head provided with a longitudinally tapered recess and a plurality of laterally extending apertures leading therefrom, and a plurality of externally tapered chuck blocks located in said recess and having mutually interlocking surfaces on their adjacent faces, one of said members having a lug thereon and the other having an elongated recess therein with one end of which said lug is engageable.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

BENJ. HASTINGS.

Witnesses:

GEORGE H. GILMAN, HARVEY C. BERKEY.

flB'opies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

